Electric drive axle gear lubricating structure and electric drive axle

Abstract

The utility model discloses an electric drive axle gear lubrication structure and an electric drive axle, the electric drive axle gear lubrication structure is installed on an axle housing, and comprises a speed reduction housing, an intermediate shaft and a gear pump assembly; the key point of the utility model is that the inner cavities of the speed reduction shell and the axle shell are communicated to form an oil cavity; an oil outlet channel is formed in the middle shaft, a transmission assembly is connected to the outer circumferential wall of the middle shaft, and an oil outlet hole communicating with the oil outlet channel is inwards formed in the position, corresponding to the transmission assembly, of the middle shaft. The gear pump assembly comprises a mounting cover and a pump body connected between the intermediate shaft and the mounting cover and communicated with the oil outlet channel, the mounting cover is provided with an oil inlet channel communicated with the pump body, the oil inlet channel extends to the side wall of the inner cavity of the speed reduction shell, an oil inlet is formed in the side wall of the inner cavity, and the oil inlet is connected with an oil inlet pipe communicated with the oil cavity; the built-in oil way is formed by the oil outlet channel, the oil inlet channel and the oil inlet pipe in the oil cavity, installation is easy, the oil inlet pipe is prevented from being collided, and the service life of the oil inlet pipe is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile accessories, in particular to an electric drive axle gear lubrication structure and an electric drive axle. Background Art

[0002] The electric drive axle of an engineering vehicle is generally provided with an external lubrication system, which lubricates the transmission components of the electric drive axle by conveying lubricating oil into the interior of the electric drive axle. The existing electric drive axle structure includes a bridge housing, a reduction housing and an intermediate shaft. The reduction housing is arranged on the front side of the bridge housing and the inner cavities of the two are connected. The intermediate shaft is installed in the inner cavity of the reduction housing through a bearing and a transmission component is installed thereon. The transmission component includes an input gear and an output gear installed on the outer peripheral wall of the intermediate shaft. The lubrication system arranges an oil pipe corresponding to the bearing, input gear and output gear respectively. Each oil pipe extends from the outside to the inside into the inner cavity of the reduction housing to convey lubricating oil to the bearing, input gear and output gear, that is, the pipeline of the lubrication system is external. However, the above structure is difficult to install due to the large number of oil pipes and limited installation space. In addition, during the use of the vehicle, the oil pipe is prone to collision, resulting in damage, shortening its service life and increasing maintenance costs. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an electric drive axle gear lubrication structure and an electric drive axle which can achieve easy installation and extend service life by arranging a built-in oil circuit on a reduction housing.

[0004] To achieve the above purpose, the embodiment of the utility model adopts the following technical solutions:

[0005] The electric drive axle gear lubrication structure is installed on the axle housing and includes a reduction housing, an intermediate shaft and a gear pump assembly;

[0006] The reduction housing is arranged on one side of the axle housing and the inner cavities of the two are connected to form an oil cavity for containing lubricating oil;

[0007] The intermediate shaft is rotatably connected to the reduction housing through a bearing and has an oil outlet passage inside, the oil outlet passage extending along the axial direction of the intermediate shaft, a transmission assembly is connected to the outer peripheral wall of the intermediate shaft and an oil outlet hole communicating with the oil outlet passage is opened inwardly corresponding to the transmission assembly;

[0008] The gear pump assembly is located outside one end of the intermediate shaft, and includes a mounting cover located outside the end surface of the intermediate shaft and connected to the reduction housing, and a pump body connected between the intermediate shaft and the mounting cover and connected to the oil outlet passage. The mounting cover is provided with an oil inlet passage connected to the pump body, and the oil inlet passage extends to the inner cavity side wall of the reduction housing and forms an oil inlet port on the inner cavity side wall, and the oil inlet port is connected to an oil inlet pipe connected to the oil cavity.

[0009] Furthermore, the mounting cover opens a first channel outwardly and toward the pump body on the inner end surface close to the intermediate shaft, and the reduction housing opens a second channel connected to the first channel outwardly and toward the first channel on the inner cavity side wall corresponding to the first channel, the second channel and the first channel form the oil inlet channel and form an oil inlet port on the inner cavity side wall.

[0010] Furthermore, a mounting hole is provided inwardly on the outer wall of the reduction housing corresponding to the end surface of the intermediate shaft, the mounting hole passes through the inner cavity side wall, and the mounting cover is disposed on the outer end of the mounting hole and the two are fixed.

[0011] Furthermore, the reduction housing includes a bearing seat that cooperates with the mounting hole, the outer end of the bearing seat extends outward from the mounting hole, the bearing seat has a accommodating hole that runs through its inner and outer ends, the bearing is fitted in the accommodating hole, one end of the intermediate shaft cooperates with the bearing, and the mounting cover is arranged on the outer end of the accommodating hole and is provided with a through hole for connecting to the oil inlet channel.

[0012] Furthermore, the inner end surface of the mounting cover is concavely arranged outwardly to form a recess corresponding to the end surface of the intermediate shaft, and the pump body is located in the recess and fixedly connected to the mounting cover.

[0013] Furthermore, a connecting hole is recessed at the end surface of the intermediate shaft close to the pump body corresponding to the oil outlet passage, and the connecting hole is communicated with the oil outlet passage. The gear pump assembly includes a pump coupling located between the intermediate shaft and the pump body, one end of the pump coupling cooperates with the connecting hole, and the other end is connected to the power take-off shaft of the pump body, and the pump coupling is communicated with the oil outlet passage and the pump body.

[0014] Furthermore, a fixing hole is recessed at one end of the intermediate shaft away from the pump body corresponding to the oil outlet passage, the fixing hole is connected to the oil outlet passage and is fitted with a plug, the plug is provided with an inner hole passing through the plug along the axial direction of the intermediate shaft, and the diameter of the inner hole is smaller than the diameter of the oil outlet passage.

[0015] Furthermore, the transmission assembly includes an input gear, a first output gear, a second output gear and a clutch located between the first output gear and the second output gear, which are sleeved on the outer peripheral wall of the intermediate shaft. The oil outlet passage is coaxial with the intermediate shaft, and the outer peripheral wall of the intermediate shaft is provided with an oil outlet hole inwardly corresponding to the input gear, the first output gear, the second output gear and the clutch.

[0016] The electric drive axle gear lubrication structure of the utility model is provided with an oil outlet on the intermediate shaft and an oil inlet on the mounting shell, and an oil inlet pipe connected to the oil chamber is connected to the oil inlet of the oil inlet, so that the oil outlet, the oil inlet and the oil inlet form a built-in oil circuit in the oil chamber, that is, the gear lubrication system is encapsulated in the reduction housing, which is not only easy to install, but also prevents the oil inlet from being bumped, thereby extending the service life of the oil inlet and further reducing the maintenance cost. The electric drive axle gear lubrication structure of the utility model is simple, easy to install and low in cost.

[0017] An embodiment of the utility model further provides an electric drive axle, comprising an axle housing and the electric drive axle gear lubrication structure described in any one of the above embodiments, wherein the electric drive axle gear lubrication structure is installed on the axle housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a partial three-dimensional exploded view of the electric drive axle gear lubrication structure of the utility model embodiment;

[0019] Figure 2 for Figure 1 A cross-sectional view of

[0020] Figure 3 for Figure 2 A magnified view of the local area A;

[0021] Figure 4 for Figure 2 Enlarged view of local B. DETAILED DESCRIPTION

[0022] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0023] like Figures 1 to 4 As shown, an embodiment of the utility model provides an electric drive axle gear lubrication structure, which is installed on a bridge housing 100 of an engineering vehicle electric drive axle, and includes a reduction housing 1, an intermediate shaft 2 and a gear pump assembly 3, wherein the intermediate shaft 2 and the gear pump assembly 3 are installed in the reduction housing 1.

[0024] like Figures 1 to 3As shown, the axle housing 100 has a front side wall and a rear side wall located behind the front side wall, and a rear end cover 300 is fixed to the rear side wall of the axle housing 100. The reduction housing 1 is arranged on one side of the axle housing 100, and the inner cavities of the two are connected to form an oil chamber 200 for containing lubricating oil. Specifically, the reduction housing 1 is fixed to the front side wall of the axle housing 100 by bolts; the outer side wall of the reduction housing 1 corresponds to the end surface of the intermediate shaft 2 and is provided with a mounting hole 14 inwardly, and the mounting hole 14 passes through the inner side wall 11; the reduction housing 1 also includes a bearing seat 15 matched with the mounting hole 14, and there are two bearing seats 15, one bearing seat 15 corresponds to one end of an intermediate shaft 2, and the outer end of the bearing seat 15 extends outward from the mounting hole 14, and the bearing seat 15 has a receiving hole 151 passing through its inner and outer ends, and a bearing (not numbered) is matched in the receiving hole 151.

[0025] like Figures 1 to 3 As shown, the intermediate shaft 2 is rotatably connected to the reduction housing 1 through bearings. Specifically, the two ends of the intermediate shaft 2 are respectively matched with the bearings in the two bearing seats 15. An oil outlet 21 is provided inside the intermediate shaft 2, and the oil outlet 21 extends along the axial direction of the intermediate shaft 2. A transmission assembly is connected to the outer peripheral wall of the intermediate shaft 2, and an oil outlet hole 22 communicating with the oil outlet 21 is provided inwardly corresponding to the transmission assembly. Specifically, the transmission assembly includes an input gear 5, a first output gear 6, a second output gear 7, and a clutch 8 located between the first output gear 6 and the second output gear 7, which are sleeved on the outer peripheral wall of the intermediate shaft 2. The oil outlet passage 21 is coaxial with the intermediate shaft 2. The input gear 5 is used to mesh with the motor transmission gear of the electric drive axle. The clutch 8 achieves gear shifting by meshing with the first output gear 6 or the second output gear 7. The outer peripheral wall of the intermediate shaft 2 is provided with an oil outlet hole 22 corresponding to the input gear 5, the first output gear 6, the second output gear 7 and the clutch 8, so as to transport lubricating oil to the input gear 5, the first output gear 6, the second output gear 7 and the clutch 8 through the oil outlet hole 22.

[0026] like Figure 2 , Figure 3As shown, the gear pump assembly 3 is located outside one end of the intermediate shaft 2, and includes a mounting cover 31 located outside the end surface of the intermediate shaft 2 and connected to the reduction housing 1, and a pump body 32 connected between the intermediate shaft 2 and the mounting cover 31 and connected to the oil outlet 21. Specifically, the mounting cover 31 is arranged on the outer end of the mounting hole 14 and the two are fixed. The mounting cover 31 is provided with an oil inlet 311 connected to the pump body 32. The oil inlet 311 extends to the inner cavity side wall 11 of the reduction housing 1 and forms an oil inlet 12 on the inner cavity side wall 11. The oil inlet 12 is connected to an oil inlet pipe 4 connected to the oil chamber 200. The oil inlet pipe 4 is inserted below the liquid level of the lubricating oil, so that the oil outlet 21, the oil inlet 311 and the oil inlet pipe 4 form a built-in oil circuit in the oil chamber 200, that is, the gear lubrication system is encapsulated in the reduction housing 1, which is not only easy to install, but also prevents the oil inlet pipe 4 from being bumped, thereby extending the service life of the oil inlet pipe 4 and further reducing the maintenance cost.

[0027] like Figure 2 , Figure 3 As shown, specifically, in order to facilitate processing and installation, the mounting cover 31 is close to the inner end surface of the intermediate shaft 2 and opens a first channel 3111 outwardly and toward the pump body 32. The first channel 3111 and the mounting cover 31 are cast integrally. Correspondingly, the reduction housing 1 and the inner cavity side wall 11 corresponding to the first channel 3111 open a second channel 13 connected to the first channel 3111 outwardly and toward the first channel 3111. The second channel 13 and the first channel 3111 form the oil inlet channel 311 and form the oil inlet port 12 on the inner cavity side wall 11. In this embodiment, the mounting cover 31 is arranged on the outer end of the accommodating hole 151 and is fixed to the bearing seat 15 by screws. The mounting cover 31 is provided with a through hole 312 for connecting to the oil inlet passage 311. The through hole 312 is for the lubricating oil in the oil inlet passage 311 to pass through. The inner end surface of the mounting cover 31 is also concave outwardly corresponding to the end surface of the intermediate shaft 2 to form a recess 313. The pump body 32 is located in the recess 313 and is fixedly connected to the mounting cover 31 by bolts, so that it is encapsulated in the inner cavity of the reduction housing 1.

[0028] like Figure 2 , Figure 3 As shown, in this embodiment, the end surface of the intermediate shaft 2 close to the pump body 32 is concavely provided with a connecting hole 23 corresponding to the oil outlet 21, and the connecting hole 23 is connected to the oil outlet 21. The gear pump assembly 3 includes a pump coupling 33 located between the intermediate shaft 2 and the pump body 32. One end of the pump coupling 33 is threadedly matched with the connecting hole 23, and the other end is threadedly connected to the power take-off shaft 321 of the pump body 32. The pump coupling 33 is connected to the oil outlet 21 and the pump body 32 for the passage of lubricating oil. That is, the gear pump assembly 3 is connected to the intermediate shaft 2 through the pump coupling 33 to achieve power take-off from the intermediate shaft 2 and to deliver lubricating oil to the oil outlet 21. Figure 4As shown, a fixing hole 24 is recessed at one end of the intermediate shaft 2 away from the pump body 32 corresponding to the oil outlet passage 21. The fixing hole 24 is connected to the oil outlet passage 21 and has an internal thread matched with a plug 25. The plug 25 has an inner hole 251 extending through it along the axial direction of the intermediate shaft 2. The diameter of the inner hole 251 is smaller than the diameter of the oil outlet passage 21 to maintain the liquid amount and oil pressure of the lubricating oil in the oil outlet passage 21, thereby ensuring a good lubrication effect.

[0029] When the motor starts, the intermediate shaft 2 rotates, causing the gear pump assembly 3 to start working. At this time, the lubricating oil in the oil chamber 200 flows from the oil inlet pipe 4 through the second channel 13, the through hole 312, the first channel 3111, the pump body 32, the power take-off shaft 321, the pump coupling 33, and the oil outlet channel 21 into each oil outlet hole 22, so that the lubricating oil flows from each oil outlet hole 22 into the input gear 5, the first output gear 6, the second output gear 7 and the clutch 8 respectively.

[0030] The electric drive axle gear lubrication structure of the utility model is provided with an oil outlet on the intermediate shaft and an oil inlet on the mounting shell, and an oil inlet pipe connected to the oil chamber is connected to the oil inlet of the oil inlet, so that the oil outlet, the oil inlet and the oil inlet form a built-in oil circuit in the oil chamber, that is, the gear lubrication system is encapsulated in the reduction housing, which is not only easy to install, but also prevents the oil inlet from being bumped, thereby extending the service life of the oil inlet and further reducing the maintenance cost. The electric drive axle gear lubrication structure of the utility model is simple, easy to install and low in cost.

[0031] The embodiment of the utility model further provides an electric drive axle, which is applied to engineering vehicles, and includes an axle housing 100 and the electric drive axle gear lubrication structure described in any of the above embodiments, wherein the electric drive axle gear lubrication structure is installed on the axle housing 100.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. The electric drive axle gear lubrication structure is installed on the axle housing and is characterized by: Including reduction housing, intermediate shaft and gear pump assembly; The reduction housing is arranged on one side of the axle housing and the inner cavities of the two are connected to form an oil cavity for containing lubricating oil; The intermediate shaft is rotatably connected to the reduction housing through a bearing and has an oil outlet passage inside, the oil outlet passage extending along the axial direction of the intermediate shaft, a transmission assembly is connected to the outer peripheral wall of the intermediate shaft and an oil outlet hole communicating with the oil outlet passage is opened inwardly corresponding to the transmission assembly; The gear pump assembly is located outside one end of the intermediate shaft, and includes a mounting cover located outside the end surface of the intermediate shaft and connected to the reduction housing, and a pump body connected between the intermediate shaft and the mounting cover and connected to the oil outlet passage. The mounting cover is provided with an oil inlet passage connected to the pump body, and the oil inlet passage extends to the inner cavity side wall of the reduction housing and forms an oil inlet port on the inner cavity side wall, and the oil inlet port is connected to an oil inlet pipe connected to the oil cavity.

2. The electric drive axle gear lubrication structure according to claim 1, characterized in that: The mounting cover opens a first channel outwardly and toward the pump body on the inner end surface close to the intermediate shaft, and the reduction housing opens a second channel connected to the first channel outwardly and toward the first channel on the inner cavity side wall corresponding to the first channel. The second channel and the first channel form the oil inlet passage and form an oil inlet port on the inner cavity side wall.

3. The electric drive axle gear lubrication structure according to claim 1, characterized in that: An installation hole is provided inwardly on the outer wall of the reduction housing corresponding to the end surface of the intermediate shaft, and the installation hole passes through the inner cavity side wall. The installation cover is arranged on the outer end of the installation hole and the two are fixed.

4. The electric drive axle gear lubrication structure according to claim 3, characterized in that: The reduction housing includes a bearing seat that cooperates with the mounting hole, and the outer end of the bearing seat extends outward from the mounting hole. The bearing seat has a receiving hole that runs through its inner and outer ends. The bearing is fitted in the receiving hole, and one end of the intermediate shaft cooperates with the bearing. The mounting cover is arranged on the outer end of the receiving hole and is provided with a through hole for connecting to the oil inlet channel.

5. The electric drive axle gear lubrication structure according to claim 1, characterized in that: The inner end surface of the mounting cover is concave outwardly corresponding to the end surface of the intermediate shaft to form a recessed portion, and the pump body is located in the recessed portion and fixedly connected to the mounting cover.

6. The electric drive axle gear lubrication structure according to claim 1, characterized in that: The end surface of the intermediate shaft close to the pump body is recessed to form a connecting hole corresponding to the oil outlet passage, and the connecting hole is communicated with the oil outlet passage. The gear pump assembly includes a pump coupling located between the intermediate shaft and the pump body, one end of the pump coupling cooperates with the connecting hole, and the other end is connected to the power take-off shaft of the pump body, and the pump coupling is communicated with the oil outlet passage and the pump body.

7. The electric drive axle gear lubrication structure according to claim 1, characterized in that: A fixing hole is formed at one end face of the intermediate shaft away from the pump body corresponding to the oil outlet passage, the fixing hole is connected to the oil outlet passage and is fitted with a plug, the plug is provided with an inner hole passing through the plug along the axial direction of the intermediate shaft, and the diameter of the inner hole is smaller than the diameter of the oil outlet passage.

8. The electric drive axle gear lubrication structure according to claim 1, characterized in that: The transmission assembly includes an input gear, a first output gear, a second output gear and a clutch located between the first output gear and the second output gear, which are sleeved on the outer peripheral wall of the intermediate shaft. The oil outlet passage is coaxial with the intermediate shaft. The outer peripheral wall of the intermediate shaft is provided with an oil outlet hole inwardly corresponding to the input gear, the first output gear, the second output gear and the clutch.

9. Electric drive axle, characterized in that: It comprises a bridge housing and an electric drive axle gear lubrication structure as claimed in any one of claims 1 to 8, wherein the electric drive axle gear lubrication structure is mounted on the bridge housing.

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